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Nitrate Mass Balance Calculation <br />Azevedo Property <br />Existing Residence <br />Data Input: <br />Effluent Quantity (Q): 560 gals/day <br />Effluent Stream (Nw): 45.00 mg/L-N <br />Site Area (A): 4.97 Acres <br />Concentration Rain (Nb): 1.00 mg/L-N <br />Denitrification (d): 35.0% <br />Deep Perc. of Rain (R): 4.49 in/yr <br />Result: <br />Mass Balance (NO: 8.1 mg/L-N <br />MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br />Percent of MCL Nitrate as N 81% <br />Waste Loading (W): 1.51 in/yr <br />Equations: <br />Find (W) <br />(W) in = (Q) g x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br />yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br />1.51 in/yr (site) =560 gal/day x (1 cu-ft /7.48 gals) x (365 days/ 1 year) x (1 acre / 43,560 sq-ft) x (12 in / 1 ft) x (1 site /4.97 acres) <br />Nc = WN (1-d)+RNb <br />W+R Hantzsche-Fennemore Equation (Nc) <br /> <br />8.13 mg/L-N = ((1.51 in/yr x 45 mg/L-N x (1-0.35))+(4.49 in/yr x 1mg/L-N))/(1.51 in/yr +4.49 in/yr) <br />Variables: <br />Nc = Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate (8.13 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (1.51 inches/year). <br />Nw = Total nitrate-N concentration of waste water percolate (45 mg/L-N). <br />d = Fraction of nitrate-N loss due to denitrification in the soil (35%). <br />R = Uniform deep percolation of rainfall (4.49 in/yr). <br />Nb = Background nitrate-N concentration of rainfall (1 mg/L-N). <br />Assumptions: <br />Total nitrogen concentration of waste stream based on estimate of 45 mg/L-N. <br />Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br />Estimated deep percolation of rainfall is 4.49 in/yr, see deep percolation of rain worksheet. <br />Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />lierracon